ausblenden:
Schlagwörter:
Charge density, Charge density waves, Gadolinium compounds, Magnetic field effects, Single crystals, Tellurium compounds, Topology, Antiferromagnetics, Antiferromagnets, Band splitting, External magnetic field, Field-induced, High mobility, High Speed, Magnetic-field, Metallic state, Van der Waal, Van der Waals forces
Zusammenfassung:
GdTe3, a van der Waals-type antiferromagnetic (AFM) metal with high mobility, is gaining a lot of attention for its potential use in high-speed spintronic devices as well as for fundamental physics research. Due to the magnetocrystalline anisotropy of GdTe3, exotic effects are envisaged, when the magnetic configurations interact with an external magnetic field. In this work, a magnetic-field-induced Weyl state in GdTe3 is revealed. In the AFM state, GdTe3 is topologically trivial. However, when an external magnetic field exceeding ∼20 T aligns all spins, band splitting occurs, and then a topological transition is induced, i.e., from a trivial metallic state to a topological Weyl metallic state. In addition, a topological change of Fermi surfaces, i.e., a field-induced Lifshitz transition, is uncovered, which may also be rooted in band splitting. Moreover, high-pressure electrical transport measurements reveal a peculiar superconducting transition with a nearly invariant superconducting transition temperature (Tc∼4.2 K) spanning a wide range of pressure up to 48 GPa. These findings imply that GdTe3 provides a unique platform for investigating not only the interactions of charge-density-wave fluctuations and superconductivity but also the interplay between magnetism and topology. © 2023 American Physical Society.
